Plot: When a mysterious race of creatures takes over a desolate Earth, humanity must take refuge in SkyArk, the city in the sky. After the rebellion against a corrupt leadership fails, the wealthy doom the rebels' children to live on the ruins of the old Earth. The rebel leader's son, Rags, must lead his fellow exiles against the monsters in order to have a chance to return to SkyArk, but he soon finds that he has a much greater purpose in saving humanity.
Alternative Plot: After his father is killed leading an uprising in a floating city, Rags is branded with 13 marks and sent to the monster-filled Earth below. He meets his fellow exiles and learns he is destined to lead them to safety in the ruins of old Earth.
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